HTC Vivid notification problem

I have an HTC Vivid PH39100 that has stopped giving me notifications on 3 different apps. All three have notfications turned on to vibrate when I have a notification but they all just stopped working. I even turned on the sound notification with no resolution. I have restarted the phone, no difference, pulled the battery and sim card, no difference. Other notifications show up in the notification bar like recently updated apps. Anyone have this problem or know a solution?

Welcome to Android Central! Try going to Settings>Apps, select the app in questions, and uncheck "Show Notifications." Wait a little bit, maybe do something else on the phone, then go back and check it back on again. Does that do anything? Also try tapping Clear Cache for those apps.